News Release

Marathon Petroleum Corp. and MPLX LP announce agreement for approximately $8.1 billion dropdown to MPLX, and MPC initiates offer to exchange its general partner interests, including its IDRs, in MPLX

FINDLAY, Ohio, Nov. 13, 2017 - Marathon Petroleum Corp. (NYSE: MPC) and MPLX LP (NYSE: MPLX) today announced an agreement for the dropdown of refining logistics assets and fuels distribution services to MPLX for total consideration of approximately $8.1 billion. The transaction is expected to close on Feb. 1, 2018, and be immediately accretive to MPLX's distributable cash flow per unit.

These assets and services are projected to generate annual earnings before interest, taxes, depreciation and amortization (EBITDA) of $1 billion. MPC is contributing these assets and services in exchange for $4.1 billion in cash and MPLX equity valued at approximately $4 billion. The equity to be issued will consist of 111.6 million MPLX common (LP) units and 2.3 million general partner (GP) units to maintain MPC's 2 percent GP interest in MPLX.

"We are very pleased to have reached agreement on the terms for the remaining dropdown to MPLX outlined in our strategic actions," said Gary R. Heminger, chairman and CEO of both MPC and MPLX. "The addition of these high-quality, fee-based revenue streams to MPLX further diversifies the partnership's earnings and contributes substantially to the distributable cash flow base of the partnership."

Year-to-date through October, MPC has returned $2.75 billion to its shareholders and plans further return of capital with the after-tax cash proceeds of this dropdown once the transaction closes, in a manner consistent with managing its current investment grade credit profile.

The dropdown agreement was approved by the MPLX board of directors following the approval of the terms of the transaction by its independent conflicts committee. The conflicts committee was advised by Jefferies LLC as to financial matters and Andrews Kurth Kenyon LLP as to legal matters. MPC was advised by Tudor, Pickering, Holt & Co. as to financial matters. The closing of the dropdown transaction is subject to customary conditions, including tax and regulatory review.

Michael J. Hennigan, president of MPLX, added, "We are very enthusiastic about this drop and the substantial benefits it provides to the partnership. The ability to add these stable earnings streams, particularly the fuels distribution services, which require no maintenance capital, is a unique opportunity to supplement the financial strength of the partnership. It also supports our focus on growing distribution coverage while building a sustainable and attractive growth path for LP distributions well into the future."

Today, MPC also offered to the MPLX board an exchange of its GP economic interests in MPLX, which include incentive distribution rights (IDRs), for newly issued MPLX common units. This transaction is expected to provide a clear valuation for MPC's GP interests in MPLX, and reduce MPLX's cost of capital to support the sustainable long-term growth of the partnership. MPC will continue to own the non-economic general partner interest in MPLX. This transaction is now under review by the conflicts committee of the MPLX board of directors. Subject to approval of the MPLX board, the exchange is expected to close on Feb. 1, 2018, in conjunction with the closing of the dropdown.

In connection with entering into the dropdown agreement, MPLX entered into a commitment letter with Mizuho Bank, Ltd.; Bank of America Merrill Lynch; The Bank of Tokyo-Mitsubishi UFJ, Ltd.; Barclays Bank PLC; JPMorgan Chase Bank, N.A.; and Wells Fargo Bank, N.A. for a $4.1 billion 364-day term-loan facility to be funded upon the closing of the dropdown transaction expected on Feb. 1, 2018. The proceeds from the term-loan facility will be used to fund the cash portion of the dropdown consideration. These commitments are subject to customary conditions, including the closing of the dropdown transaction.

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About Marathon Petroleum Corporation

MPC is the nation's third-largest refiner, with a crude oil refining capacity of approximately 1.8 million barrels per calendar day in its seven-refinery system. Marathon brand gasoline is sold through approximately 5,600 independently owned retail outlets across 20 states and the District of Columbia. In addition, Speedway LLC, an MPC subsidiary, owns and operates the nation's second-largest convenience store chain, with approximately 2,730 convenience stores in 21 states. MPC owns, leases or has ownership interests in approximately 10,800 miles of crude oil and light product pipelines. Through subsidiaries, MPC owns the general partner of MPLX LP, a midstream master limited partnership. Through MPLX, MPC has ownership interests in gathering and processing facilities with approximately 5.9 billion cubic feet per day of gathering capacity, 8 billion cubic feet per day of natural gas processing capacity and 570,000 barrels per day of fractionation capacity. MPC's fully integrated system provides operational flexibility to move crude oil, NGLs, feedstocks and petroleum-related products efficiently through the company's distribution network and midstream service businesses in the Midwest, Northeast, East Coast, Southeast and Gulf Coast regions.

About MPLX LP

MPLX is a diversified, growth-oriented master limited partnership formed in 2012 by Marathon Petroleum Corporation to own, operate, develop and acquire midstream energy infrastructure assets. We are engaged in the gathering, processing and transportation of natural gas; the gathering, transportation, fractionation, storage and marketing of NGLs; and the transportation, storage and distribution of crude oil and refined petroleum products. Headquartered in Findlay, Ohio, MPLX's assets consist of a network of crude oil and products pipeline assets located in the Midwest and Gulf Coast regions of the United States; 62 light-product terminals with approximately 24 million barrels of storage capacity; an inland marine business; storage caverns with approximately 2.8 million barrels of storage capacity; crude oil and product storage facilities (tank farms) with approximately 5 million barrels of available storage capacity; a barge dock facility with approximately 78,000 barrels per day of crude oil and product throughput capacity; and gathering and processing assets that include approximately 5.9 billion cubic feet per day of gathering capacity, 8 billion cubic feet per day of natural gas processing capacity and 570,000 barrels per day of fractionation capacity.

Forward-looking StatementsThis press release contains forward-looking statements within the meaning of federal securities laws regarding Marathon Petroleum Corporation ("MPC") and MPLX LP ("MPLX"). These forward-looking statements relate to, among other things, expectations, estimates and projections concerning the business and operations of MPC and MPLX, including proposed strategic initiatives and our value creation plans. You can identify forward-looking statements by words such as "anticipate," "believe," "design," "estimate," "expect," "forecast," "goal," "guidance," "imply," "intend," "objective," "opportunity," "outlook," "plan," "position," "pursue," "prospective," "predict," "project," "potential," "seek," "strategy," "target," "could," "may," "should," "would," "will" or other similar expressions that convey the uncertainty of future events or outcomes. Such forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the companies' control and are difficult to predict. Factors that could cause MPC's actual results to differ materially from those implied in the forward-looking statements include: the time, costs and ability to obtain regulatory or other approvals and consents and otherwise consummate the strategic initiatives discussed herein; the satisfaction or waiver of conditions in the agreements governing the strategic initiatives discussed herein; our ability to achieve the strategic and other objectives related to the strategic initiatives discussed herein; our ability to generate sufficient income and cash flow to effect the intended share repurchases, including within the expected timeframe; our ability to manage disruptions in credit markets or changes to our credit rating; the potential impact on our share price if we are unable to effect the intended share repurchases; adverse changes in laws including with respect to tax and regulatory matters; inability to agree with the MPLX conflicts committee with respect to the timing of and value attributed to assets identified for dropdown and/or the general partner economic interests; continued/further volatility in and/or degradation of market and industry conditions; the impact of adverse market conditions affecting MPC's and MPLX's midstream businesses; modifications to MPLX earnings and distribution growth objectives, and other risks described below with respect to MPLX; changes to MPC's capital budget; other risk factors inherent to MPC's industry; and the factors set forth under the heading "Risk Factors" in MPC's Annual Report on Form 10-K for the year ended Dec. 31, 2016, filed with Securities and Exchange Commission (SEC). Factors that could cause MPLX's actual results to differ materially from those implied in the forward-looking statements include: negative capital market conditions, including an increase of the current yield on common units, adversely affecting MPLX's ability to meet its distribution growth guidance; the time, costs and ability to obtain regulatory or other approvals and consents and otherwise consummate the strategic initiatives discussed herein; the satisfaction or waiver of conditions in the agreements governing the strategic initiatives discussed herein; our ability to achieve the strategic and other objectives related to the strategic initiatives discussed herein; adverse changes in laws including with respect to tax and regulatory matters; inability to agree with respect to the timing of and value attributed to assets identified for dropdown and/or the general partner economic interests; the adequacy of MPLX's capital resources and liquidity, including, but not limited to, availability of sufficient cash flow to pay distributions and access to debt to fund anticipated dropdowns on commercially reasonable terms, and the ability to successfully execute its business plans and growth strategy; the timing and extent of changes in commodity prices and demand for crude oil, refined products, feedstocks or other hydrocarbon-based products; continued/further volatility in and/or degradation of market and industry conditions; changes to the expected construction costs and timing of projects; completion of midstream infrastructure by competitors; the suspension, reduction or termination of MPC's obligations under MPLX's commercial agreements; modifications to earnings and distribution growth objectives; the level of support from MPC, including dropdowns, alternative financing arrangements, taking equity units, and other methods of sponsor support, as a result of the capital allocation needs of the enterprise as a whole and its ability to provide support on commercially reasonable terms; changes to MPLX's capital budget; other risk factors inherent to MPLX's industry; and the factors set forth under the heading "Risk Factors" in MPLX's Annual Report on Form 10-K for the year ended Dec. 31, 2016, filed with the SEC. In addition, the forward-looking statements included herein could be affected by general domestic and international economic and political conditions. Unpredictable or unknown factors not discussed here, in MPC's Form 10-K or in MPLX's Form 10-K could also have material adverse effects on forward-looking statements. Copies of MPC's Form 10-K are available on the SEC website, MPC's website at http://ir.marathonpetroleum.com or by contacting MPC's Investor Relations office. Copies of MPLX's Form 10-K are available on the SEC website, MPLX's website at http://ir.mplx.com or by contacting MPLX's Investor Relations office.

Non-GAAP Financial MeasuresThe EBITDA forecasts were determined on an EBITDA-only basis. Accordingly, information related to the elements of net income, including tax and interest, are not available and, therefore, reconciliations of these non-GAAP financial measures to the nearest GAAP financial measures have not been provided.

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